Project layout

from pathlib import Path

root = Path("kioskpkg")
root.mkdir(exist_ok=True)
(root / "__init__.py").write_text(
    "from kioskpkg.prices import line_total\n",
    encoding="utf-8",
)
(root / "prices.py").write_text(
    '''def line_total(units, price, tax=0.16):
    return round(units * price * (1 + tax), 2)
''',
    encoding="utf-8",
)
Path("config.json").write_text(
    '{"city": "Nairobi", "tax": 0.16}\n',
    encoding="utf-8",
)
Path("README.md").write_text("# Nairobi kiosk\n\nPricing helpers.\n", encoding="utf-8")
Path("test_prices.py").write_text(
    '''import unittest
from kioskpkg.prices import line_total

class PriceTests(unittest.TestCase):
    def test_two(self):
        self.assertEqual(line_total(2, 10), 23.2)
''',
    encoding="utf-8",
)

print(sorted(p.name for p in Path(".").iterdir() if p.name != ".browser_decode"))
print(sorted(p.name for p in root.iterdir()))

from pathlib import Path
import json
import unittest

root = Path("kioskpkg")
root.mkdir(exist_ok=True)
(root / "__init__.py").write_text("", encoding="utf-8")
(root / "prices.py").write_text(
    '''def line_total(units, price, tax=0.16):
    return round(units * price * (1 + tax), 2)
''',
    encoding="utf-8",
)
Path("config.json").write_text('{"city": "Nairobi", "tax": 0.16}\n', encoding="utf-8")

from kioskpkg.prices import line_total

cfg = json.loads(Path("config.json").read_text(encoding="utf-8"))
print(cfg["city"], line_total(2, 10, cfg["tax"]))

class PriceTests(unittest.TestCase):
    def test_two(self):
        self.assertEqual(line_total(2, 10), 23.2)

suite = unittest.defaultTestLoader.loadTestsFromTestCase(PriceTests)
result = unittest.TextTestRunner(verbosity=2).run(suite)
print("ok" if result.wasSuccessful() else "failed")